Results 211 to 220 of about 66,931 (265)

1H NMR and IR spectra of methyl dichloropropanoates and butanoates

Tetrahedron, 1981
Abstract Methyl dichloropropanoates and butanoates were synthesized and their 1H NMR and IR spectra were studied. Comparisons were made with the spectral characteristics of corresponding monochlorocompounds. Special attention was given to the elucidation of the characteristic spectral features associated with particular chlorine substitution patterns.
Maija Pitkänen, Ilpo O.O. Korhonen, Jorma N.J. Korvola   +2 more
openaire   +1 more source

IR and NMR Spectra of Crystalline and Amorphous Copper Metaborate

Russian Physics Journal, 2005
IR and NMR spectroscopic investigations of crystalline and amorphous copper metaborate CuB 2 O 4 as well as of copper metaborate crystallized from the amorphous state have been carried out for the first time.
G. A. Petrakovskii, L. V. Udod, K. A. Sablina, Yu. N. Ivanov, A. Ya. Korets, A. F. Bovina   +5 more
openaire   +1 more source

IR- and NMR-spectra and structure of acyl salts of azomethins

Journal of Molecular Structure, 1990
Abstract The products of interaction of number of aldimines with halide acyls have been studied using the molecular spectroscopy methods. The salt structures formed are shown to have ionic composition. Differences in reactivity of the salts are explained on the basis of information about their electronic composition.
C.Ju. Chotiy, M.S. Platitsa, V.I. Rybachenko, V.F. Galat, E.V. Titov   +4 more
openaire   +1 more source

Low-temperature NMR and IR Spectra of Photomerocyanine Form of Spirophenanthrooxazine

Chemistry Letters, 2003
Abstract Low-temperature 13C NMR and IR spectra of the metastable photomerocyanine (PMC) of spirophenanthrooxazine (SPO) show that PMC is in quinoidal structure. Especially, 13C NMR study directly evidences the formation of two quinoidal PMCs in CD2Cl2 upon UV irradiation. The quantum chemical study of SPO shows that among open forms TTC
Duck-Hyung Lee, Myunghee Lee, Chinkap Chung, Weon-Hee Lee, In-Ja Lee   +4 more
openaire   +1 more source

The13C NMR, UV and IR absorption spectra of pyridinedicarboxylic acids

Chemistry of Heterocyclic Compounds, 1999
The13C NMR, UV and IR absorption spectra of 2,3-, 2,4-, 2,5-, 2,6-, 3,4-, and 3,5-pyridinedicarboxylic acids were recorded and their spectral parameters were assigned. The influence of electronic properties of the substituents on the direction of the chemical shifts is discussed.
L. Wasylina, E. Kucharska, Z. Weglinski, A. Puszko   +3 more
openaire   +1 more source

Theoretical IR, Raman and NMR spectra of 1,2- and 1,3-dimethylenecyclobutane

Vibrational Spectroscopy, 2001
Abstract Equilibrium geometries, rotational constants, harmonic vibrational frequencies, infrared intensities, Raman activities, and 1 H and 13 C NMR spectra were calculated for 1,2-dimethylenecyclobutane and its less stable isomer 1,3-dimethylenecyclobutane by using MP2, DFT (B3PW91), and RHF theoretical methods involving the 6-311++G ∗∗ basis ...
Joanna E Rode, Jan Cz Dobrowolski, Michał H Jamróz, Marek A Borowiak   +3 more
openaire   +1 more source

Experimental and theoretical study on IR and NMR spectra of several tetrachlorinated diphenyl sulfides

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
Tetrachlorinated diphenyl sulfides (TCDPSs) are environmentally interesting compounds. In this paper, both experimental and theoretical studies on IR and (1)H NMR as well as (13)C NMR chemical shifts of 4 synthesized TCDPSs have been carried out.
Ruijuan, Qu, Xuesheng, Zhang, Qi, Zhang, Xi, Yang, Zunyao, Wang, Liansheng, Wang   +5 more
openaire   +2 more sources

IR and/or NMR Spectra-Structure Correlations for Organophosphorus Compounds

Applied Spectroscopy, 1988
IR and/or NMR spectra-structure correlations are presented which are useful in the identification of organophosphorus compounds.
openaire   +1 more source

High-resolution1H NMR and IR spectra of OH-groups of oxide catalysts

Reaction Kinetics and Catalysis Letters, 1985
Chemical shifts in high-resolution PMR spectra of hydroxyl groups of SiO2, Al2O3, aluminosilicate, phosphate and H-ZSM-5 zeolite catalysts have been measured and compared with IR spectroscopic data and proton charges calculated by the MINDO/3 method.
V. M. Mastikhin, I. L. Mudrakovskii, N. S. Kotsarenko, L. G. Karakchiev, A. G. Pelmenshchikov, K. I. Zamaraev   +5 more
openaire   +1 more source

Isolation and Identification of 9-cis Astaxanthin by HPLC, FT-IR, and NMR Spectra

Journal of Applied Spectroscopy, 2021
This study aims to perform a detailed qualitative analysis of astaxanthin isomers. A rapid, open column chromatography method was developed to separate astaxanthin geometrical isomers in gram-scale levels. Chromatographic separation was performed using two silica gel columns with dichloromethane/n-hexane/diethyl ether (2:1:1, v/v/v) as elution system ...
Y. Wang, Y. Wu, T. Wang, D. Qiua
openaire   +1 more source